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Cavity-agnostic acoustofluidic manipulations enabled by guided flexural waves on a membrane acoustic waveguide actuator

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Microsystems & Nanoengineering 2024年第2期10卷 153-171页

作者： Philippe Vachon Srinivas Merugu Jaibir Sharma Amit Lal Eldwin J.Ng yul Koh Joshua E.-y.lee Chengkuo lee Department of Electrical and Computer Engineering National University of SingaporeSingaporeSingapore Institute of Microelectronics Agency for ScienceTechnology and Research(A*STAR)SingaporeSingapore SonicMEMS Laboratory School of Electrical and Computer EngineeringCornell UniversityIthacaNYUSA School of Electrical and Data Engineering University of Technology SydneyUltimoNSWAustralia

This article presents an in-depth exploration of the acoustofluidic capabilities of guided flexural waves(GFWs)generated by a membrane acoustic waveguide actuator(MAWA).By harnessing the potential of GFWs,cavity-agnostic advanced particle manipulation functions are achieved,unlocking new avenues for microfluidic systems and lab-on-a-chip *** localized acoustofluidic effects of GFWs arising from the evanescent nature of the acoustic fields they induce inside a liquid medium are numerically investigated to highlight their unique and promising *** traditional acoustofluidic technologies,the GFWs propagating on the MAWA’s membrane waveguide allow for cavity-agnostic particle manipulation,irrespective of the resonant properties of the fluidic ***,the acoustofluidic functions enabled by the device depend on the flexural mode populating the active region of the membrane *** demonstrations using two types of particles include in-sessile-droplet particle transport,mixing,and spatial separation based on particle diameter,along with streaming-induced counter-flow virtual channel generation in microfluidic PDMS *** experiments emphasize the versatility and potential applications of the MAWA as a microfluidic platform targeted at lab-on-a-chip development and showcase the MAWA’s compatibility with existing microfluidic systems.

关键词： waveguide fluid cavity

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Comparison of the‘Seattle’and‘International’Criteria Electrocardiogram Interpretation in Division II Female Collegiate Athletes:A Preliminary Study

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Journal of Science in Sport and Exercise 2023年第3期5卷 274-279页

作者： Ludmila Cosio-Lima N.Kumar Brooke L.Adlof J.Simpson A.Crawley y.lee University of West Florida 11000 University Parkway#72/220PensacolaFL 32514USA

Purpose A 12-lead electrocardiogram(ECG)is a screening tool to detect abnormalities that may predispose athletes to sud-den cardiac *** standardized criteria have been introduced to better interpret ECG data,however this research has predominantly focused on male *** is important to include female athletes in research to better define ECG character-istics in this *** purpose of this study was to compare the Seattle and International Criteria ECG abnormalities in Division II female collegiate athletes of various *** Fifty-six females(age 20.2±1.4 years;height 1.70±0.7 m;weight 69.5±8.9 kg)completed a resting 12-lead ECG *** data was classified as‘normal’and‘abnormal’according to the parameters of each criterion and abnormal conditions were ***-square analysis was used to assess statistical comparisons between *** There was a significant difference in abnormal classifications as the total number of ECGs identified as abnormal using the Seattle Criteria decreased from 12(21.4%)to 2(3.6%)when using the International Criteria(Py reduces the total number of abnormal ECG readings in female collegiate athletes compared to the Seattle Criteria and did not overly identify African American athletes with *** research is necessary to expand on this study and clearly define criteria for female athletes of various ethnicities.

关键词： 12-lead ECG Female athletes Sudden cardiac death ECG abnormalities

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Effects of fractional-order PI controller on delay margin in single-area delayed load frequency control systems

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Journal of Modern Power Systems and Clean Energy 2019年第2期7卷 380-389页

作者： Vedat CELIK Mahmut Temel OZDEMIR Kwang y.lee Department of Electrical and Electronics Engineering Faculty of EngineeringFirat UniversityElazigTurkey Department of Electrical and Computer Engineering Baylor UniversityWacoUSA

This study aims to determine the improvement effect on the delay margin if fractional-order proportional integral(PI) controller is used in the control of a singlearea delayed load frequency control(LFC) system. The delay margin of the system with fractional-order PI control has been obtained for various fractional integral orders and the effect of them has been shown on the delay margin as a third controller parameter. Furthermore,the stability of the system that is either under or over the delay margin is examined by generalized modified Mikhailov *** stability results obtained have been confirmed numerically in time domain. It is demonstrated that the proposed controller for delayed LFC system provides more flexibility on delay margin according to integer-order PI controller.

关键词： Delay dependent stability Delay margin Fractional-order proportional integral(PI) Generalized modified Mikhailov criterion Load frequency control with delay

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Temozolomide resistance in glioblastoma multiforme

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Genes & Diseases 2016年第3期3卷 198-210页

作者： Sang y.lee Department of Neurosurgery The Pennsylvania State University College of MedicineHersheyPA 17033USA

Temozolomide(TMZ)is an oral alkylating agent used to treat glioblastoma multiforme(GBM)and ***,at least 50%of TMZ treated patients do not respond to *** is due primarily to the over-expression of O6-methylguanine methyltransferase(MGMT)and/or lack of a DNA repair pathway in GBM *** GBM cell lines are known to contain TMZ resistant cells and several acquired TMZ resistant GBM cell lines have been developed for use in experiments designed to define the mechanism of TMZ resistance and the testing of potential ***,the characteristics of intrinsic and adaptive TMZ resistant GBM cells have not been systemically *** article reviews the characteristics and mechanisms of TMZ resistance in natural and adapted TMZ resistant GBM cell *** also summarizes potential treatment options for TMZ resistant GBMs.

关键词： Adaptive Glioblastoma Intrinsic Resistance Temodar Temozolomide

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Multi-stage Sensitivity Analysis of Distributed Energy Systems: A Variance-based Sobol Method

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Journal of Modern Power Systems and Clean Energy 2020年第5期8卷 895-905页

作者： Shangshang Wei yiguo Li Xianhua Gao Kwang y.lee Li Sun Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education and Department of Energy and Environment Southeast UniversityNanjing 210096China IEEE Department of Electrical&Computer Engineering Baylor UniversityWacoTX 76798USA

In the face of the pressing environmental issues,the past decade witnessed the booming development of the distributed energy systems(DESs).A notable problem of DESs is the inevitable uncertainty that may make DESs deviate significantly from the deterministically obtained expectations,in both aspects of optimal design and economic *** thus necessitates the sensitivity analysis to quantify the impacts of the massive parametric *** paper aims to give a comprehensive quantification,and carries out a multi-stage sensitivity analysis on DESs from the perspectives of evaluation criteria,optimal design and economic ***,a mathematical model of a DES is developed to present the solutions to the three stages of the ***,the Monte-Carlo simulation is carried out subject to the probabilistic distributions of the energy,technical and economic *** on the simulation results,the variance-based Sobol method is applied to calculate the individual importance,interactional importance and total importance of various *** comparison of the multi-stage results shows that only a few parameters play critical roles while the uncertainty of most of the massive parameters has little impact on the system *** addition,the influence of parameter interactions in the optimal design stage are much stronger than that in the evaluation criteria and operation strategy stages.

关键词： Sensitivity analysis uncertainty operation design optimization parameter characteristic distributed energy system(DES)

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Effect of coating material and lubricant on forming force and surface defects in wire drawing process

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Transactions of Nonferrous Metals Society of China 2011年第A1期21卷 104-110页

作者： S.M.ByON S.J.lee D.W.lee y.H.lee y.lee Department of Mechanical Engineering Dong-A University Department of Mechanical Engineering Chung-Ang University Wire Rod Research Group POSCO Technical Research Laboratories

A pilot wire drawing machine as well as wire end-pointing roller was developed. Using these machines, a wire drawing test for four different coating materials and two different lubricants was performed as the reduction ratio increased from 10% to 30%. Materials used for a substrate in this study are plain carbon steel (AISI1045) and ultra low carbon bainite steel. To compute the friction coefficient between the coating layer of wire and the surface of die for a specific lubricant, a series of finite element analyses were carried out. SEM observations were also conducted to investigate the surface defects of wire deformed. Results show that the behavior of drawing force varies with the lubricant-type at the initial stage of drawing. The powder-typed lubricant with a large particle causes the retardation of full lubrication on the entire contact surface and the local delamination of coating layer on the wire surface. As the flow stress of a substrate increases, the delamination becomes severe.

关键词：涂层材料模具表面拉丝工艺表面缺陷润滑剂成形力超低碳贝氏体钢润滑油型

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Experimental and finite element analysis for fracture of coating layer of galvannealed steel sheet

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Transactions of Nonferrous Metals Society of China 2011年第A1期21卷 111-116页

作者： S.I.KIM J.U.HER y.C.JANG y.lee Sheet Products and Process Research Group POSCO Techology Research Laboratory Department of Mechanical Engineering Chung-Ang University

Mechanical properties of galvannealed (GA) steel sheet used for automotive exposed panel and predicted failure phenomenon of its coating layer were evaluated using finite element method. V-bending test was performed to understand better the fracture of coating layer of GA steel sheet during plastic deformation. yield strength of the coating layer was calculated by using a relative difference between hardness of coating layer measured from the nano-indentation test and that of substrate. To measure shearing strength at the interface between substrate and coating layer, shearing test with two specimens attached by an adhesive was carried out. Using the mechanical properties measured, a series of finite element analyses coupled with a failure model was performed. Results reveal that the fracture of coating layer occurs in an irregular manner at the region where compressive deformation is dominant. Meanwhile, a series of vertical cracks perpendicular to material surface are observed at the tensile stressed-region. It is found that 0.26-0.28 of local equivalent plastic strain exists at the coating and substrate at the beginning of failure. The fracture of coating layer depends on ductility of the coating layer considerably as well.

关键词：有限元分析镀锌钢板断裂涂层界面剪切强度实验纳米压痕试验等效塑性应变

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Integrated Optimal Siting and Sizing for VSCHVDC-link-based Offshore Wind Farms and Shunt Capacitors

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Journal of Modern Power Systems and Clean Energy 2021年第2期9卷 274-284页

作者： yong Li Xuebo Qiao Chun Chen yi Tan Wenchao Tian Qiuping Xia yijia Cao Kwang y.lee the College of Electrical and Information Engineering Hunan UniversityChangsha 410082China the Zhangjiakou Power Supply Company State Grid Jibei Electric Power Company LimitedZhangjiakou 075000China the Department of Electrical and Computer Engineering Baylor UniversityWacoTexas 76798-7356USA the School of Electrical and Information Engineering Changsha University of Science and TechnologyChangsha 410082China

It is economic and secure to determine the optimal siting and sizing of the offshore wind farms(OWFs)integrated into the AC system through voltage-source converter high-voltage direct current(VSC-HVDC)*** this paper,an integrated planning model for the VSC-HVDC-link-based OWFs and the capacitors is proposed,where a decomposition technique is presented to solve the proposed mixed-integer nonlinear programming(MINLP)problem and obtain the optimal *** model can optimize the siting and sizing of the OWFs to improve the voltage profile and reduce the adverse influence of the reactive power of the *** the proposed planning model,the total investment costs,operation costs and maintenance costs of the OWFs,VSC-HVDC links,and the capacitors can be *** on the modified IEEE 118-bus system show that the proposed integrated planning model can provide more economic scheme than the independent planning scheme,in which the capacitors are planned after the ***,a series of sensitivity analysis on certain equipment costs are studied to obtain the regular pattern for sizing VSC stations.

关键词： Capacitor installed capacity point of common coupling(PCC) offshore wind farm(OWF) voltage-source converter high-voltage direct current(VSC-HVDC)link

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Gender differences in the impact on subjective well-being in China

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Economic and Political Studies 2018年第4期6卷 349-367页

作者： Tao Tao Byron y.lee Lynda Jiwen Song Xiangdong Liu School of Sociology and Population Studies Center for Population and Development StudiesRenmin University of ChinaBeijingChina China Europe International Business School(CEIBS) ShanghaiChina School of Business Renmin University of ChinaBeijingChina

This article examines the relationship among subjective well-being(SWB),income and education in China through self-perceived social *** and women appear to use different socioeconomic markers to determine their self-perceived social status,which ultimately affects their subjective reports of *** using the data from the 2010 China General Social Survey(CGSS),this study finds a positive association between income and SWB for *** result also shows a positive association between education and SWB for ***,for women self-perceived social status is a strong mediator of income and happiness;while for men,selfperceived social status mediates the relationship between education and *** study highlights the importance of the cultural influence in understanding the differences in self-perceived social status outcomes by gender and how these differences ultimately influence the subjective measures of well-being in China.

关键词： China gender selfperceived status subjective well-being(SWB)

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火电厂多代理控制系统(英文)

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控制理论与应用 2004年第3期21卷 405-410页

作者：常江 Kwang y.lee Raul GARDUNO-RAMIREZ 深圳职业技术学院机械电气工程系广东深圳518055 美国宾西法尼亚州州立大学电气工程系电气研究所仪器控制组(IIE)

针对火电厂非线性、多变量和多控制目标的特点,设计了一个火电厂多代理控制系统(PPMACS).在PP MACS中,前馈控制代理(FFCAs)采用神经模糊系统进行决策,反馈控制代理(FBCAs)采用基于遗传算法的模糊系统进行决策.优化任务分解代理(OTDAs)... 详细信息

针对火电厂非线性、多变量和多控制目标的特点,设计了一个火电厂多代理控制系统(PPMACS).在PP MACS中,前馈控制代理(FFCAs)采用神经模糊系统进行决策,反馈控制代理(FBCAs)采用基于遗传算法的模糊系统进行决策.优化任务分解代理(OTDAs)通过一个优化代理和一个分解代理来进行多目标优化分解PPMACS的任务.协调代理根据运行条件协调PPMACS的各个代理.仿真结果显示了火电厂多代理控制系统能够实现火电单元机组的多目标运行和大范围负荷跟踪.神经网络、模糊逻辑和遗传算法是PPMACS中的智能代理进行决策的有效工具.

关键词：决策反馈控制前馈控制模糊逻辑遗传算法多代理控制系统神经网络

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